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H. WALBAUM Jr ELEVATOR GUARD.

No. 548,147 Pat ented Oct. 15, 1895.

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' H. WALBAUM Jr.

ELEVATOR GUARD.

2 sheets-sheet 2.

No; 548,147. Patented 001;. 15,1895.

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I UNITED STATES PATENT OFFICE.

HENRY WALBAUM, JR, OF ROCHESTER, NEW YORK, ASSIGNOR OF TWO- THIRDS TOEDWARD W. GOHR AND GUSTAVE O. FELSKEY, OF SAME PLACE.

ELEVATOR-GUARD.

SPECIFICATION forming part of Letters Patent No. 548,147, dated October15, 1895.

Application filed July 20, 1894. Serial No. 518,119- (No model.)

.To all whom it may concern.-

Be it known that I, HENRY WALBAUM, Jr., of Rochester, in the county ofMonroe and State of New York, have invented a certain new and usefulImprovement in Elevator- Guards; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the drawings accompanying this application.

My improvement relates to means for opening and closing elevator-doorsby the action of the car in rising and falling, and is of that kindwhere a long shaft extends through all the floors and is provided withclutch mechanism which shifts by the action of the car and in which thedoor is operated by an endless chain which passes around sprocketwheels.

The invention consists in the combination and arrangement of partshereinafter described and claimed.

In the drawings, Figure 1 is a front elevation of a portion of the welland one of the doors in the closed position. Fig. 2 is a crosssection ofthe well and a top view of the door and the connecting mechanism. Fig. 3is a diagram showing the shifting mechanism inside the well. Fig. 4 isan enlarged elevation of the clutch mechanism. Fig. 5 is a detail Viewshowing the shifting mechanism at the closed end of the door.

A indicates the well, and B the sliding door, which latter is shown inthe closed position in Fig. 1.

G is the vertical shaft which extends through all the floors where doorsare used. D, E, and F are three clutch-heads connected with this shaftat each doorway. The upper and lower clutch-heads D and E are connectedwith shaft 0, so as to turn with the same, while the middle clutch-headF is loose on the shaft. The upper clutch-head D, however, is movablevertically on the shaft, being retained against loose turning by a pinand slot at, Fig. 4.

G and H are two sprocket-wheels at opposite ends of the door and abovethe same, around which sprocket-wheels passes an endless chain or cableI. The sprocket-wheel G is permanently seated in the well, and the othersprocket-wheel H is attached to and forms a part of the middle slidingclutchhead F. Hence it rises and falls with the sliding clutch-head F.

K and L are two slides which move freely up and down in ways I) I),attached to the well, said slides being provided withoutwardly-projecting arms 0 and d, and also with raise the slides K andL by striking under their projecting arms 0 d as the door opens andcloses. Consequently they raise and lower the clutch-heads D Falternately as the door opens and closes.

his a knuckle attached to one side of the chain I and projectingoutward.

To open the door when closed the two clutchheads D and F are inengagement and give motion to the chain, and then the knuckle it strikesthe shank of cam M, as shown at the left in Fig. 1, and pushes it along,thus opening the door; but at the close of the opening movement of thedoor the cam M strikes under arm 0 and elevates slide K, raising theclutch-head D from contact with clutch-head F, thus stopping the door.The clutch-head F remains out of contact with both clutches D E as longas the car stands at the opening. Hence the door is open and stationary.When the carleaves the opening, the clutch-head F falls into engagementwith clutch-head E, thereby lowering the end of the chain and droppingthe knuckle h under the bend in of cam M, and the knuckle then escapesand the chain moves onward, carrying the knuckle with it in the reversedirection. The knuckle h in the reverse motion then strikes adownwardly-projecting arm Z of a slide n, sliding in and out on anextension 10 of the cam M, and closes the door again. At the end of theclosing movement of the door a lug 8, attached to the slide n, strikes awedge-shaped cam t, attached to the well, which draws the slide outwardaway from contact till the arm I frees from the knuckle h, thusdisconnecting from the door. The chain I always runs in the samedirection.

Attached to the slide L is a chain or cord P, passing over pulleys w wand attached at its inner end to a crank-arm R, pivoted to the innerside of the well. On the lower end of the crank-arm is a friction-rollery. On the side of the car is a cam S in the form of a spring. This ispressed out by a dog z. In the up or down movement of the car the cam Sstrikes the roller y, throws the crank-arm R, and draws upon the cord P,thereby elevating the slide L and engaging the two clutch-heads F and Dto open the door, as before described. When the car leaves the opening,the cam disengages from the crank.- arm and allows the slide to drop andbrings clutch-head F into engagement with clutchhead E to close thedoor.

Any other suitable mechanism may be employed in place of the cam S andthe crank R.

'l is a guide-rod overwhich knuckle h rides to hold it up and preventslack.

Having described my invention, I claim- 1. In an elevator guard, thecombination, with the sliding door, of the shaft; 0, the clutch heads DE F resting thereon, the middle one, F, being vertically movable, thesprocket Wheels G I-I, one attached to the well, the other to theclutch-head F, the cam M secured to the door, and the chain I running onthe sprocket Wheels, said chain being provided with a knuckle h whichcomes in contact with the cam to impart motion to the door, as hereinshown and described.

2. In an elevator guard, the combination, with the sliding door, of thechain I provided with the knuckle h, the cam M provided with theextension 19, the slide at resting on the extension and movable forwardand back, the arm .2 on the slide, and the wedge shaped cam 25 fordrawing the slide endwise, as herein shown and described.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

HENRY WALBAUM, JR.

Vitnesses:

R. F. OSGOOD, CHAS. A. WIDENER.

